在人体细胞中进行的大规模RNAi选,确定了p53通路的新组件
Katrien Berns1, E Marielle Hijmans, Jasper Mullenders
1Division of Molecular Carcinogenesis and Center for Biomedical Genetics, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.
Nature
|March 26, 2004
概括
一个新的RNA干扰 (RNAi) 库,包含23,742个短毛RNAs (shRNAs),可以在人类细胞中进行大规模的遗传选. 这种工具确定了p53依赖的增殖停止的新调节剂,推进了基因功能研究.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- RNA干扰 (RNAi) 对于识别简单生物体中的基因功能至关重要.
- 哺乳动物细胞的大规模基因查以前因缺乏有效工具而受到限制.
- 短发针RNAs (shRNAs) 为哺乳动物细胞中稳定的基因抑制提供了一种方法.
研究的目的:
- 开发和利用一个全面的RNAi库,用于大规模的功能丧失在人类细胞中的遗传选.
- 使用这个shRNA库来识别p53-依赖的增殖停止的新型调节剂.
- 建立有效的方法来识别与细胞表型相关的特定shRNA载体.
主要方法:
- 构建一个逆转录病毒载体库,编码23742个不同的shRNA,针对7914个人类基因.
- 在人类细胞中应用shRNA库来选p53-依赖的增殖停止调节剂.
- 开发siRNA条形码屏幕,以快速识别与表型相关的siRNA载体.
主要成果:
- 鉴定了一种已知的和五种调节p53-依赖的增殖停止的新基因.
- 证明这些已识别的基因的抑制会对p53和p19ARF依赖的增殖停止产生抗性.
- 观察到这些基因的抑制消除了DNA损伤诱导的G1细胞循环停止.
结论:
- 开发的shRNA库和选方法显著提高了哺乳动物细胞大规模功能丧失遗传选的能力.
- 这些已识别的基因代表了增殖停止途径的关键调节者,包括涉及p53和p19ARF的基因.
- 这些工具有望加速发现复杂生物系统中的基因功能和细胞信号通路组件.
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